The deals also represent a windfall for GE (GE), which is supplying the engines for the plane.

The 777X family includes two models: the 777-9X and the 777-8X.

The 9X will seat over 400 passengers and have a range of more than 8,200 nautical miles (15,185 km). The aircraft will have the "lowest operating cost per seat of any commercial airplane," Boeing says.